[RFC 0/2] ABI for clock_gettime_ns

[Andy Lutomirski]

On x86-64, clock_gettime is so fast that the overhead converting to and
from nanoseconds is non-negligible.  clock_gettime_ns is a different
interface that is potentially faster.  If people like the ABI, I'll
implement an optimized version.

For the git-inclined, this series is at
https://git.kernel.org/?p=linux/kernel/git/luto/linux.git;a=shortlog;h=refs/heads/timing/clock_gettime_ns/rfc_v1

Andy Lutomirski (2):
  Add clock_gettime_ns syscall
  x86-64: Add __vdso_clock_gettime_ns vsyscall

 arch/x86/include/asm/unistd_64.h |    2 +
 arch/x86/vdso/vclock_gettime.c   |   70 +++++++++++++++++++++++++++++---------
 arch/x86/vdso/vdso.lds.S         |    7 ++++
 include/linux/syscalls.h         |    2 +
 kernel/posix-timers.c            |   29 ++++++++++++++++
 5 files changed, 94 insertions(+), 16 deletions(-)

-- 
1.7.7.4

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